The theme installs through Substratum Theme Engine app, that you can download here, IT REQUIRES ROOT, Busybox, and a Layers or Substratum compatible ROM: https://goo.gl/BB5eio
THEME ABLE GOOGLE APPS REQUIRED, install this app* https://goo.gl/nH1xlo , download the package for your system, and install it from your recovery.
*If you don’t want the app, you can directly download the flashable zip here.https://goo.gl/r1BnxK